If you have to do maintenance tasks on your own Hyosung RT125D then it will always be recommended to have access to a Workshop Manual to use as personal reference should you want to know ways to strip off a certain part for instance the Dashboard and install it again the right way.
Hyosung RT125D Workshop Manuals provides targeted diagnostic guides for your vehicle so if something is playing up it will help you find out what the situation is and methods to correct it. Then you are able to determine if you can do this by yourself or in the event the job is just too big you can actually make a reservation for your RT125D into a local mechanic.
Hyosung RT125D manual